4,396 research outputs found

    Weather-based interruption prediction in the smart grid utilizing chronological data

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    This unique study will demonstrate a combined effect of weather parameters on the total number of power distribution interruptions in a region. Based on common weather conditions, a theoretical model can predict interruptions and risk assessment with immediate weather conditions. Using daily and hourly weather data, the created models will predict the number of daily or by-shift interruptions. The weather and environmental conditions to be addressed will include rain, wind, temperature, lightning density, humidity, barometric pressure, snow and ice. Models will be developed to allow broad applications. Statistical and deterministic simulations of the models using the data collected will be conducted by employing existing software, and the results will be used to refine the models. Models developed in this study will be used to predict power interruptions in areas that can be readily monitored, thus validating the models. The application has resulted in defining the predicted number of interruptions in a region with a specific confidence level. Reliability is major concern for every utility. Prediction and timely action to minimize the outage duration improves reliability. Use of this predictor model with existing smart grid self-healing technology is proposed

    DTKI: a new formalized PKI with no trusted parties

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    The security of public key validation protocols for web-based applications has recently attracted attention because of weaknesses in the certificate authority model, and consequent attacks. Recent proposals using public logs have succeeded in making certificate management more transparent and verifiable. However, those proposals involve a fixed set of authorities. This means an oligopoly is created. Another problem with current log-based system is their heavy reliance on trusted parties that monitor the logs. We propose a distributed transparent key infrastructure (DTKI), which greatly reduces the oligopoly of service providers and allows verification of the behaviour of trusted parties. In addition, this paper formalises the public log data structure and provides a formal analysis of the security that DTKI guarantees.Comment: 19 page

    Las tobas cuaternarias del río Añamaza (provincia de Soria, Cordillera Ibérica): aproximación cronológica

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    High-gradient, stepped fluvial tufa systems with dammed areas existed in the River Añamaza valley (NW Iberian Ranges, Spain) during Quaternary times. Single deposits range from a few meters to about 70 m thick, in which prograding-aggrading wedges separated by erosional surfaces exist. Several episodes of tufa formation have been distinguished by means of U-series, Amino-acid racemization and radiocarbon techniques. These correlate to MIS 8, 7, 5 and 1. The presence of MIS 9 is uncertain, as chronological data may also correspond to older stages. Most tufas in this area formed in MIS 5. Distinct tufa episodes can also be distinguished in the Holocene. These are the first chronological data presented for one of the northernmost Quaternary tufa systems in the Iberian Ranges

    Deterministic regression model and visual basic code for optimal.

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    A new, non-statistical method is presented for analysis of the past history and current evolution of economic and financial processes. The method is based on the sliding model approach using linear differential or difference equations applied to discrete information in the form of known chronological data (time series) about the process. An algorithm is proposed that allows one to project the current evolution of the process onto some period of its future development. Computer code in visual basic is developed that has been validated in application to American stock index S&P 500, with predicted values within 5% of real data over long periods of the recent past history. The algorithm and the code can be applied to practical problems in finance and economy in time of its normal evolution without catastrophic events.Sliding deterministic regression models; Optimal forecasting in finance;

    The Spatial and Temporal Distribution of Lunar Mare Basalts As Deduced From Analysis of Data for Lunar Meteorites

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    In this work we analyze chronological data for lunar meteorites with emphasis on the spatial and temporal distribution of lunar mare basalts. The data are mostly from the Lunar Meteorite Compendium (http://www-curator.jsc.nasa.gov/antmet/lmc/contents.cfm cited thereafter as Compendium) compiled by Kevin Righter and from the associated literature

    DESIGN OF INVESTIGATION SUPPORT SYSTEM PROTOTYPE (A Case Study in Train Accident Investigation at DAOP 4 Semarang)

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    Investigation can be a complex task without any supporting system that provides a necessary data or relevant information. Such as investigation of the PT Kereta Api Indonesia (KAI) in analyzing a train accident due to human error is limited. Analysis conducted by KAI only focuses on individuals who are related and have not been able to analyze the error causes in detail because of lack of data. This research tried to design investigation support system prototype to facilitate all of the processes needed in analysis a train accident. The processes started with the interview process using Critical Decision Method (CDM) and inferred using the Emergent Themes Analysis (ETA). Then a systematic method of Human Factors Analysis Classification System Indonesian Railroad (HFACS-IR) used to analyze human error especially for train accidents occurred in Indonesia. At last, accident scenarios constructed by the Linking Causal Factor. The result shows that investigation process suggested able to give more effective recommendation and the prototype design make these processes easie

    Adverse events following intravesical Bacillus Calmette-Guérin therapy in Mater Dei Hospital, Malta

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    Introduction: Intravesical administration of Bacillus Calmette-Guerin (BCG), following transurethral resection of bladder tumour, has been shown to reduce recurrence and progression in appropriately selected patients with non-muscle invasive bladder cancer. The aim of the study was to report the local incidence and range of adverse events experienced by patients managed with intravesical BCG. Methods: All patients who received at least one dose of intravesical BCG treatment at Mater Dei Hospital in 2014 were included in the study. A database including demographic, histological and chronological data, together with complication type, degree and treatment required was created. Patient medical files were reviewed and the patients were invited to take part in this audit via a telephone survey. Results: 55 patients satisfied inclusion criteria and were included in the study. 54 patients were documented to have had induction BCG, with maintenance BCG in 32 patients. 22 of these experienced at least 1 adverse event with BCG, whilst 33 had no complications. 1 patient had 3 adverse events, 7 patients had 2 adverse events and 14 patients had 1 complication. Most adverse events were considered to be mild or moderate in severity. Storage bladder symptoms accounted for most of these adverse events. No death as a consequence of intravesical BCG therapy was recorded. Conclusion: Intravesical BCG therapy remains one of the mainstay therapies in the management of bladder cancer. The majority of adverse effects recorded were self-limiting or easily treatable with oral analgesics or antibiotics.peer-reviewe

    Holocene Hydrological Changes Inferred from Alluvial Stream Entrenchment in North Tian Shan (Northwestern China)

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    We analyze the possible contribution of climate change or tectonics on fluvial incision from the study of a case example along the northern flank of Tian Shan. The rivers that exit the high range fed large alluvial fans by the end of the last glacial period. They have since deeply entrenched the piedmont by as much as 300 m. We have surveyed several terraces that were cut and abandoned during river entrenchment, providing information on intermediate positions of the riverbed during downcutting. They suggest a gradual decline in river slope during a major phase of incision throughout the Holocene. Tectonic uplift affects only a zone about 5 km wide, corresponding to a growing anticline, and is shown to account for about 10% of total incision. Incision was therefore most probably driven by climate change. From observed fluvial incision, we estimate the water discharge in excess of that needed to carry the sediments supplied by hillslope erosion in the headwaters. We used a model based on a transport‐limited erosion law. The model predicts relaxation process with entrenchment in the upper reach, downstream progradation of the incision‐sedimentation line, and a progressive decrease of river slope during incision consistent with our observations. According to this model, river slope might be used as a proxy for specific discharge and then for volumetric discharge, provided that an assumption is made about river width variations. We conclude that river incision in the study area has resulted from dynamic adjustment of the hydrological system to the settlement of wetter conditions in the early Holocene, when water discharge might have been about three times as high as at present. Then, a rather arid climate with enhanced seasonality has likely prevailed from the mid‐Holocene (~6 ka B.P.) until now

    A note to transfer a generic database pseudocode for storing chronological data from research in apiaries

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    In honey bee research conducted in apiaries, a large amount of information is usually generated requiring a flexible database for storing and retrieving data. Here, we developed a generic database pseudocode, based on the abstraction of the apiary system, for data collected from the colonies through time.We thank J Chávez-Galarza for the fruitful discussions during the design of the database architecture. This research was funded through the 2013-2014 BiodivERsA/FACCE-JPI joint call for research proposals, with the national funders “Fundação para a Ciência e Tecnologia” (Portugal), “Agence Nationale de la Recherche” (France), and “Ministério de Economia y Competividade” (Spain).info:eu-repo/semantics/publishedVersio
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